This undated photo shows a sign on the Grand Canyon's Bright Angel Trail warning people not to hike to the Colorado River and back in one day. Federal authorities charged Christopher Carlson, of Indianapolis, who remained in jail on Thursday on six counts of child abuse after he forced his three young grandsons to hike 18 miles in triple-digit heat at the Grand Canyon and denied them food and water, authorities said. The boys, ages 12, 9 and 8, told investigators that they had been hit, pushed, choked, pinched and squeezed during trips on a popular trail at the canyon's South Rim last month. (AP Photo/Felicia Fonseca)

Question: Have you hiked to the bottom of the Grand Canyon & back? Can you tell us about your adventure?